New results from the CUORE experiment

Abstract

The Cryogenic Underground Observatory for Rare Events (CUORE) is the first cryogenic experiment searching for neutrinoless double-beta ($0\hat{I}½{\hat{I}}^2{\hat{I}}^2$) decay that has been able to reach the one-ton scale. The detector, located at the Laboratori Nazionali del Gran Sasso in Italy, consists of an array of 988 TeO${}_2$ crystals arranged in a compact cylindrical structure of 19 towers. Following the completion of the detector construction in August 2016, CUORE began its first physics data run in 2017 at a base temperature of about 10 mK. Following multiple optimization campaigns in 2018, CUORE is currently in stable operating mode. In 2019, CUORE released its 2\textsuperscript{nd} result of the search for $0\hat{I}½{\hat{I}}^2{\hat{I}}^2$ with a TeO${}_2$ exposure of 372.5 kg$\cdot$yr and a median exclusion sensitivity to a ${}^{130}$Te $0\hat{I}½{\hat{I}}^2{\hat{I}}^2$ decay half-life of $1.7\cdot 10^{25}$ yr. We find no evidence for $0\hat{I}½{\hat{I}}^2{\hat{I}}^2$ decay and set a 90\% C.I. (credibility interval) Bayesian lower limit of $3.2\cdot 10^{25}$ yr on the ${}^{130}$Te $0\hat{I}½{\hat{I}}^2{\hat{I}}^2$ decay half-life. In this work, we present the current status of CUORE's search for $0\hat{I}½{\hat{I}}^2{\hat{I}}^2$, as well as review the detector performance. Finally, we give an update of the CUORE background model and the measurement of the ${}^{130}$Te two neutrino double-beta ($2\hat{I}½{\hat{I}}^2{\hat{I}}^2$) decay half-life.

Proceeding of 40th International Conference on High Energy physics (ICHEP2020), July 28 - August 6, 2020, Prague, Czech Republic (virtual meeting). arXiv admin note: text overlap with arXiv:1905.07667